Transformer testing

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I have in 50 ac tranny@ 40 amps  , it's unmarked but is 240 primary
however how to id windings  , any suggestions as of course I wont be
just plugging stuff in , ex telecomms
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Re: Transformer testing
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Well the dc resistance of the primary would be much higher than the
secondary for starters. If there are taps on the primary it should  be
easy to identify the highest resistance pair to start off with and
experiment with since if it's 415v you wont be doing any harm by hooking
that up to 230v.


Re: Transformer testing

"Rheilly Phoull"
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** For a 230 VAC primary  -  expect 0.5 ohms

 For the 50VAC secondary  -  expect  22  milliohms

 A "soft start" circuit will be needed for sure - or it will trip the
breaker as soon as you switch it on.


.....   Phil




Re: Transformer testing
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Like you say :-)
What do you reckon to a 30R 100W with a switch across it ??

Re: Transformer testing
"Rheilly Phoull"
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** Depends if the PSU has to come up while under load or not.

If it does, then a couple of chunky 15 amp rated, 2 ohm NTC thermistors are
the go.


....  Phil






Re: Transformer testing
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I took a quick measurement and then excited the secondary with 10 v ac ,
soon worked out the correct primary taps to arrive at the desired 24vac out

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